with all the threads here and elsewhere dealing with turning car fuel into boat fuel, i'm wondering about a "proper" oil percentage for boats. how do the cars get away with 10 or 12%? they run hotter, & i would imagine the shock loads are higher (on & off the throttle & landing from jumps), temps are generally higher, also - 240 degrees isn't uncommon. how much will recommended % vary by engine size? or roller bearing rods vs plain bearings? more or less nitro? i've heard don ferrette mention too much oil can cause bearings to 'skid/slide', not turn/roll....... what is everyone running? what type of engine? i'm mainly interested in .21's, k&b's in my case. but any info you can share will be appreciated by all, i'm sure B) . i'm getting ready to blend some fuel, want to run less oil, if i can. running 18% now, how low can i safely go? less oil means more methanol at a given nitro %, & even i know there's more power in alcohol than oil . also, please specify if you run all synthetic, all castor, or a blend. if a blend how much of each. i can imagine oil type would affect what a "safe" % might be.
Last edited by a moderator: